. >> i basically have to say it's a hostile environment. >> reporter: seahawks supporters are speaking about their safety in the wake of previous brawls there. in 2012 season, 55 ejections, 14 felony arrests. >> i've been getting quite a few emails were day saying my son's going to the game. should he wear his jersey or i'm bringing my girlfriend. am i going to be safe? >> reporter: for its part the 49ers put together a home field manual instructing their fans how to cheer and dress the part. also suiting up on sunday, san francisco police officers. >> this is undercover uniform of the day, at candlestick park. >> reporter: the police chief says the goal is to keep fans cool after the competition heats up sunday. >> you don't want to spend the game that you spent a lot of money on the ticket in one of our paddy wagons or substation or jail. >> reporter: he won't say how many undercover officers will be at the stick on sunday. at 6:00 a surprising welcome pier 39 put together for seahawks fans and how one of the fans copes for life in 49ers territory. reporting live in san francisco, da